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(
    '28907', '28874', '30279', '30277', 
    '30275', '30273', '30271', '28970', 
    '28972', '28974', '29040', '29136', 
    '28968', '28966', '28964', '28961', 
    '28954', '28952', '28950', '28946'
  )

Query time 0.00192

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "175.72"
    },
    "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": 20,
          "rows_produced_per_join": 20,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "2.26",
            "eval_cost": "2.00",
            "prefix_cost": "4.26",
            "data_read_per_join": "150K"
          },
          "used_columns": [
            "product_id"
          ],
          "attached_condition": "(`dev2`.`P`.`product_id` in ('28907','28874','30279','30277','30275','30273','30271','28970','28972','28974','29040','29136','28968','28966','28964','28961','28954','28952','28950','28946'))"
        }
      },
      {
        "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": 122,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "12.38",
            "eval_cost": "12.24",
            "prefix_cost": "28.89",
            "data_read_per_join": "94K"
          },
          "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": 98,
          "filtered": "80.46",
          "cost_info": {
            "read_cost": "30.61",
            "eval_cost": "9.85",
            "prefix_cost": "71.74",
            "data_read_per_join": "154K"
          },
          "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": 98,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "24.63",
            "eval_cost": "9.85",
            "prefix_cost": "106.23",
            "data_read_per_join": "149K"
          },
          "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": 99,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "24.63",
            "eval_cost": "9.97",
            "prefix_cost": "140.82",
            "data_read_per_join": "274K"
          },
          "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": 99,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "24.91",
            "eval_cost": "9.98",
            "prefix_cost": "175.72",
            "data_read_per_join": "423K"
          },
          "used_columns": [
            "variant_id",
            "variant"
          ]
        }
      }
    ]
  }
}