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 = 'variant_image' 
  AND cscart_images_links.type = 'V' 
  AND cscart_images_links.object_id IN (
    748, 747, 778, 777, 780, 779, 782, 781, 
    800, 799, 802, 801, 804, 803, 806, 805, 
    808, 807, 816, 815, 826, 825, 828, 827, 
    830, 829, 842, 841, 844, 843, 846, 845, 
    856, 855, 858, 857, 860, 859, 862, 861, 
    864, 863, 894, 893, 896, 895, 898, 897, 
    916, 915, 918, 917, 920, 919, 922, 921, 
    924, 923, 932, 931, 942, 941, 944, 943, 
    946, 945, 958, 957, 960, 959, 962, 961, 
    972, 971, 974, 973, 976, 975, 978, 977, 
    980, 979
  ) 
ORDER BY 
  cscart_images_links.position, 
  cscart_images_links.pair_id

Query time 0.00224

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "475.61"
    },
    "ordering_operation": {
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "82.00"
      },
      "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": 82,
            "rows_produced_per_join": 82,
            "filtered": "100.00",
            "index_condition": "((`eshopuga_upgr_4122`.`cscart_images_links`.`object_type` = 'variant_image') and (`eshopuga_upgr_4122`.`cscart_images_links`.`type` = 'V') and (`eshopuga_upgr_4122`.`cscart_images_links`.`object_id` in (748,747,778,777,780,779,782,781,800,799,802,801,804,803,806,805,808,807,816,815,826,825,828,827,830,829,842,841,844,843,846,845,856,855,858,857,860,859,862,861,864,863,894,893,896,895,898,897,916,915,918,917,920,919,922,921,924,923,932,931,942,941,944,943,946,945,958,957,960,959,962,961,972,971,974,973,976,975,978,977,980,979)))",
            "cost_info": {
              "read_cost": "180.41",
              "eval_cost": "16.40",
              "prefix_cost": "196.81",
              "data_read_per_join": "7K"
            },
            "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": 82,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "82.00",
              "eval_cost": "16.40",
              "prefix_cost": "295.21",
              "data_read_per_join": "62K"
            },
            "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": 82,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "82.00",
              "eval_cost": "16.40",
              "prefix_cost": "393.61",
              "data_read_per_join": "48K"
            },
            "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)"
          }
        }
      ]
    }
  }
}