SELECT 
  `F`.`path`, 
  `PI`.`product_id`, 
  `PI`.`alt` 
FROM 
  `cscart_products__images` AS `PI` 
  LEFT JOIN `files` AS `F` ON `PI`.`watermark_small_file_id` = `F`.`id` 
WHERE 
  `PI`.`product_id` IN (30257, 30259, 8858, 8861, 8864)

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "17.70"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "PI",
          "access_type": "range",
          "possible_keys": [
            "product_id"
          ],
          "key": "product_id",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "rows_examined_per_scan": 14,
          "rows_produced_per_join": 14,
          "filtered": "100.00",
          "index_condition": "(`dev2`.`PI`.`product_id` in (30257,30259,8858,8861,8864))",
          "cost_info": {
            "read_cost": "6.16",
            "eval_cost": "1.40",
            "prefix_cost": "7.56",
            "data_read_per_join": "448"
          },
          "used_columns": [
            "product_id",
            "watermark_small_file_id",
            "alt"
          ]
        }
      },
      {
        "table": {
          "table_name": "F",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "4",
          "ref": [
            "dev2.PI.watermark_small_file_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 14,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "8.74",
            "eval_cost": "1.40",
            "prefix_cost": "17.70",
            "data_read_per_join": "52K"
          },
          "used_columns": [
            "id",
            "path"
          ]
        }
      }
    ]
  }
}

Result

path product_id alt
https://s3.timeweb.cloud/482029f9-prod/products__images/8858_4b5a7530d9fc_%D0%91%D0%BE%D1%80%D1%82%D0%BE%D0%B2%D0%BE%D0%B9_JAC_120.webp 8858
https://s3.timeweb.cloud/482029f9-prod/products__images/8861_199ada47c50f_%D0%91%D0%BE%D1%80%D1%82%D0%BE%D0%B2%D0%BE%D0%B9_JAC_N90.webp 8861
https://s3.timeweb.cloud/482029f9-prod/products__images/8864_0ac15e7c700f_%D0%91%D0%BE%D1%80%D1%82%D0%BE%D0%B2%D0%BE%D0%B9_JAC_200__1_.webp 8864
https://s3.timeweb.cloud/482029f9-prod/products__images/30257_7c4b193d0ce8_30258_1cb88a5f32a7_0_7492e7de7aed_IMG_4580.webp 30257
https://s3.timeweb.cloud/482029f9-prod/products__images/30257_867f47caff3e_30258_958825508a64_0_8b2c64889440_IMG_4579.webp 30257
https://s3.timeweb.cloud/482029f9-prod/products__images/30257_7ba4e040c05a_30258_4f5718079500_0_27fe7c021880_IMG_4581.webp 30257
https://s3.timeweb.cloud/482029f9-prod/products__images/30257_8454d14a5ee4_30258_5d44aeadb639_0_aead58b3ea02_IMG_4582.webp 30257
https://s3.timeweb.cloud/482029f9-prod/products__images/30257_eab9b35b49c5_30258_21276c2b0e37_0_e6170aa2fbbc_IMG_4583.webp 30257
https://s3.timeweb.cloud/482029f9-prod/products__images/30259_83202ccf55c2_30260_f31ae78b867c_0_e45080eb4886_IMG_4530.webp 30259
https://s3.timeweb.cloud/482029f9-prod/products__images/30259_0671f62b1a14_30260_b3dd82985974_0_9b88682fcbf7_IMG_4532.webp 30259
https://s3.timeweb.cloud/482029f9-prod/products__images/30259_4972d477974a_30260_3467a81fc3fc_0_bd61a740383f_IMG_4535.webp 30259
https://s3.timeweb.cloud/482029f9-prod/products__images/30259_bf43735b8bba_30260_c1c30f93bf88_0_32d71f7f78bf_IMG_4533.webp 30259
https://s3.timeweb.cloud/482029f9-prod/products__images/30259_87460802d288_30260_31d5d7c206aa_0_057ca16e1a8f_IMG_4531.webp 30259
https://s3.timeweb.cloud/482029f9-prod/products__images/30259_a0225a7fcbc3_30260_1dd79f58e0d8_0_4910cbd7a63a_IMG_4534.webp 30259