SELECT 
  `P`.`product_id`, 
  `PFD`.`internal_name` AS `name`, 
  `PFVD`.`variant`, 
  `PFVD`.`variant_id`, 
  `PFD`.`feature_id` 
FROM 
  `cscart_product_features_values` AS `PFV` 
  JOIN `cscart_product_features` AS `PF` ON `PFV`.`feature_id` = `PF`.`feature_id` 
  JOIN `cscart_products` AS `P` ON `P`.`product_id` = `PFV`.`product_id` 
  JOIN `cscart_product_features_descriptions` AS `PFD` ON `PFV`.`feature_id` = `PFD`.`feature_id` 
  JOIN `cscart_product_feature_variants` AS `PFVS` ON `PFVS`.`variant_id` = `PFV`.`variant_id` 
  JOIN `cscart_product_feature_variant_descriptions` AS `PFVD` ON `PFVS`.`variant_id` = `PFVD`.`variant_id` 
WHERE 
  1 
  AND `PF`.`status` = 'A' 
  AND `PFV`.`product_id` IN(
    '28843', '28966', '28954', '28946', 
    '12449'
  )

Query time 0.00175

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "43.86"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "P",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "cscart_products_product_id_index"
          ],
          "key": "cscart_products_product_id_index",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "rows_examined_per_scan": 5,
          "rows_produced_per_join": 5,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "0.76",
            "eval_cost": "0.50",
            "prefix_cost": "1.26",
            "data_read_per_join": "37K"
          },
          "used_columns": [
            "product_id"
          ],
          "attached_condition": "(`dev2`.`P`.`product_id` in ('28843','28966','28954','28946','12449'))"
        }
      },
      {
        "table": {
          "table_name": "PFV",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "fl",
            "variant_id",
            "product_id",
            "fpl",
            "idx_product_feature_variant_id"
          ],
          "key": "product_id",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "ref": [
            "dev2.P.product_id"
          ],
          "rows_examined_per_scan": 6,
          "rows_produced_per_join": 30,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "2.83",
            "eval_cost": "3.06",
            "prefix_cost": "7.16",
            "data_read_per_join": "23K"
          },
          "used_columns": [
            "feature_id",
            "product_id",
            "variant_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "PF",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY",
            "status"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "feature_id"
          ],
          "key_length": "3",
          "ref": [
            "dev2.PFV.feature_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 24,
          "filtered": "80.46",
          "cost_info": {
            "read_cost": "7.65",
            "eval_cost": "2.46",
            "prefix_cost": "17.87",
            "data_read_per_join": "38K"
          },
          "used_columns": [
            "feature_id",
            "status"
          ],
          "attached_condition": "(`dev2`.`PF`.`status` = 'A')"
        }
      },
      {
        "table": {
          "table_name": "PFVS",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "variant_id"
          ],
          "key_length": "3",
          "ref": [
            "dev2.PFV.variant_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 24,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "6.16",
            "eval_cost": "2.46",
            "prefix_cost": "26.49",
            "data_read_per_join": "37K"
          },
          "used_columns": [
            "variant_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "PFD",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "feature_id"
          ],
          "key_length": "3",
          "ref": [
            "dev2.PFV.feature_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 24,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "6.16",
            "eval_cost": "2.49",
            "prefix_cost": "35.14",
            "data_read_per_join": "68K"
          },
          "used_columns": [
            "feature_id",
            "internal_name"
          ]
        }
      },
      {
        "table": {
          "table_name": "PFVD",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "variant_id"
          ],
          "key_length": "3",
          "ref": [
            "dev2.PFV.variant_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 24,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "6.23",
            "eval_cost": "2.50",
            "prefix_cost": "43.86",
            "data_read_per_join": "105K"
          },
          "used_columns": [
            "variant_id",
            "variant"
          ]
        }
      }
    ]
  }
}

Result

product_id name variant variant_id feature_id
12449 Мощность двигателя, л.с. 106 12492 737
12449 Колесная формула 4x2 8752 744
12449 Страна производитель Россия 9729 758
12449 Привод Задний 13040 878
28843 Двигатель Weichai WP3NQ150E50 14535 735
28843 Мощность двигателя, л.с. 150 9659 737
28843 Грузоподъемность, кг 2000 11021 741
28843 Колесная формула 4x2 8752 744
28843 Тип двигателя Дизельный 9392 751
28843 Страна производитель Китай 9730 758
28843 Объем двигателя 2970см2 14534 838
28843 Привод Задний 13040 878
28946 Двигатель GAZ G31C 14333 735
28946 Мощность двигателя, л.с. 150 9659 737
28946 Грузоподъемность, кг 1200 11137 741
28946 Колесная формула 4x2 8752 744
28946 Тип двигателя Дизельный 9392 751
28946 Страна производитель Россия 9729 758
28946 Объем двигателя 2.5 14283 838
28946 Привод Задний 13040 878
28954 Двигатель GAZ G31C 14333 735
28954 Мощность двигателя, л.с. 150 9659 737
28954 Грузоподъемность, кг 1500 9410 741
28954 Колесная формула 4x2 8752 744
28954 Тип двигателя Дизельный 9392 751
28954 Страна производитель Россия 9729 758
28954 Объем двигателя 2.5 14283 838
28954 Привод Задний 13040 878
28966 Двигатель GAZ G31C 14333 735
28966 Мощность двигателя, л.с. 150 9659 737
28966 Грузоподъемность, кг 1500 14416 741
28966 Колесная формула 4x2 8752 744
28966 Тип двигателя Дизельный 9392 751
28966 Страна производитель Россия 9729 758
28966 Объем двигателя 2.5 14283 838
28966 Привод Задний 13040 878