SELECT 
  cscart_images.*, 
  cscart_images_links.*, 
  cscart_common_descriptions.description AS alt, 
  cscart_images.image_id AS images_image_id 
FROM 
  cscart_images_links 
  LEFT JOIN cscart_images ON cscart_images_links.image_id = cscart_images.image_id 
  LEFT JOIN cscart_common_descriptions ON cscart_common_descriptions.object_id = cscart_images.image_id 
  AND cscart_common_descriptions.object_holder = 'images' 
  AND cscart_common_descriptions.lang_code = 'it' 
WHERE 
  cscart_images_links.object_type = 'product' 
  AND cscart_images_links.type = 'M' 
  AND cscart_images_links.object_id IN (
    421, 427, 408, 382, 418, 1930, 400, 424, 
    381, 1529, 401, 1465, 1933, 428, 415, 
    391, 406, 439, 390, 393, 394, 396, 397, 
    398, 399, 422, 434, 383, 412, 419, 430, 
    431, 432, 429, 384, 395, 420, 385, 405, 
    410, 413, 417, 1937, 414, 425, 407, 389, 
    402, 388, 426, 409, 404, 1936, 387, 386, 
    416, 441, 322
  ) 
ORDER BY 
  cscart_images_links.position, 
  cscart_images_links.pair_id

Query time 0.00240

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "370.01"
    },
    "ordering_operation": {
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "65.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_images_links",
            "access_type": "range",
            "possible_keys": [
              "object_id"
            ],
            "key": "object_id",
            "used_key_parts": [
              "object_id",
              "object_type",
              "type"
            ],
            "key_length": "81",
            "rows_examined_per_scan": 65,
            "rows_produced_per_join": 65,
            "filtered": "100.00",
            "index_condition": "((`eshopuga_upgr_4122`.`cscart_images_links`.`object_type` = 'product') and (`eshopuga_upgr_4122`.`cscart_images_links`.`type` = 'M') and (`eshopuga_upgr_4122`.`cscart_images_links`.`object_id` in (421,427,408,382,418,1930,400,424,381,1529,401,1465,1933,428,415,391,406,439,390,393,394,396,397,398,399,422,434,383,412,419,430,431,432,429,384,395,420,385,405,410,413,417,1937,414,425,407,389,402,388,426,409,404,1936,387,386,416,441,322)))",
            "cost_info": {
              "read_cost": "136.01",
              "eval_cost": "13.00",
              "prefix_cost": "149.01",
              "data_read_per_join": "6K"
            },
            "used_columns": [
              "pair_id",
              "object_id",
              "object_type",
              "image_id",
              "detailed_id",
              "type",
              "position"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_images",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "image_id"
            ],
            "key_length": "4",
            "ref": [
              "eshopuga_upgr_4122.cscart_images_links.image_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 65,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "65.00",
              "eval_cost": "13.00",
              "prefix_cost": "227.01",
              "data_read_per_join": "49K"
            },
            "used_columns": [
              "image_id",
              "image_path",
              "image_x",
              "image_y",
              "is_high_res"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_common_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "object_id",
              "lang_code",
              "object_holder"
            ],
            "key_length": "107",
            "ref": [
              "eshopuga_upgr_4122.cscart_images.image_id",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 65,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "65.00",
              "eval_cost": "13.00",
              "prefix_cost": "305.01",
              "data_read_per_join": "38K"
            },
            "used_columns": [
              "object_id",
              "description",
              "lang_code",
              "object_holder"
            ],
            "attached_condition": "<if>(is_not_null_compl(cscart_common_descriptions), (`eshopuga_upgr_4122`.`cscart_common_descriptions`.`object_id` = `eshopuga_upgr_4122`.`cscart_images`.`image_id`), true)"
          }
        }
      ]
    }
  }
}