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 (9184, 14253, 14714, 18006, 20475)

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "14.23"
    },
    "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": 11,
          "rows_produced_per_join": 11,
          "filtered": "100.00",
          "index_condition": "(`dev2`.`PI`.`product_id` in (9184,14253,14714,18006,20475))",
          "cost_info": {
            "read_cost": "5.11",
            "eval_cost": "1.10",
            "prefix_cost": "6.21",
            "data_read_per_join": "352"
          },
          "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": 11,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "6.92",
            "eval_cost": "1.10",
            "prefix_cost": "14.23",
            "data_read_per_join": "40K"
          },
          "used_columns": [
            "id",
            "path"
          ]
        }
      }
    ]
  }
}

Result

path product_id alt
https://s3.timeweb.cloud/482029f9-prod/products__images/9184_0ec76b4d7173_%D0%B2%D0%B0%D1%85%D1%82%D0%BE%D0%B2%D1%8B%D0%B9_%D0%B0%D0%B2%D1%82%D0%BE%D0%B1%D1%83%D1%81_%D0%BD%D0%B5%D1%84%D0%B0%D0%B7_%D0%BA%D0%B0%D0%BC%D0%B0%D0%B7.webp 9184
https://s3.timeweb.cloud/482029f9-prod/products__images/14253_52958afc5b0b_vax_3th7-zp_df5z-mf.webp 14253
https://s3.timeweb.cloud/482029f9-prod/products__images/14714_f9245866ab27_22165-95629_ro85-af_ohvx-8z.webp 14714
https://s3.timeweb.cloud/482029f9-prod/products__images/14714_a759449e56ec_12206-95640_70sq-bb.webp 14714
https://s3.timeweb.cloud/482029f9-prod/products__images/14714_b111f79cb544_12206-95639_s4sv-qy.webp 14714
https://s3.timeweb.cloud/482029f9-prod/products__images/18006_06a7110d465e_processed_f8793d7624465b93ab55eb4d1cb71830.webp 18006
https://s3.timeweb.cloud/482029f9-prod/products__images/20475_2bd5653ebcab_processed_cc259388cad280c41a2c6032bac68ffb.webp 20475
https://s3.timeweb.cloud/482029f9-prod/products__images/20475_2dae461ac696_processed_3b643522ff8969283a2b0a5dbed10adf.webp 20475
https://s3.timeweb.cloud/482029f9-prod/products__images/20475_3a0c8b96d806_processed_e286ba04a9820b46a2b7c2dfcad5a663.webp 20475
https://s3.timeweb.cloud/482029f9-prod/products__images/20475_2b4a85efb4ed_processed_1fae9670ac9fab84658d97071e592e3b.webp 20475
https://s3.timeweb.cloud/482029f9-prod/products__images/20475_0953d9c33bdc_processed_e3981b17e928c1b14332c6c0966fc50c.webp 20475