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 = 'en' 
WHERE 
  cscart_images_links.object_type = 'product' 
  AND cscart_images_links.type = 'A' 
  AND cscart_images_links.object_id IN (
    68137, 66758, 37263, 37916, 39922, 39927, 
    66859, 68342
  ) 
ORDER BY 
  cscart_images_links.position, 
  cscart_images_links.pair_id

Query time 0.00075

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "116.43"
    },
    "ordering_operation": {
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "30.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_images_links",
            "access_type": "range",
            "possible_keys": [
              "object_id",
              "idx_object_type_type_position"
            ],
            "key": "object_id",
            "used_key_parts": [
              "object_id",
              "object_type",
              "type"
            ],
            "key_length": "81",
            "rows_examined_per_scan": 30,
            "rows_produced_per_join": 30,
            "filtered": "100.00",
            "index_condition": "((`cscart_db`.`cscart_images_links`.`object_type` = 'product') and (`cscart_db`.`cscart_images_links`.`type` = 'A') and (`cscart_db`.`cscart_images_links`.`object_id` in (68137,66758,37263,37916,39922,39927,66859,68342)))",
            "cost_info": {
              "read_cost": "29.53",
              "eval_cost": "3.00",
              "prefix_cost": "32.53",
              "data_read_per_join": "2K"
            },
            "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": [
              "cscart_db.cscart_images_links.image_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 30,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "25.18",
              "eval_cost": "3.00",
              "prefix_cost": "60.70",
              "data_read_per_join": "22K"
            },
            "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": [
              "cscart_db.cscart_images.image_id",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 30,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "22.73",
              "eval_cost": "3.00",
              "prefix_cost": "86.43",
              "data_read_per_join": "17K"
            },
            "used_columns": [
              "object_id",
              "description",
              "lang_code",
              "object_holder"
            ],
            "attached_condition": "<if>(is_not_null_compl(cscart_common_descriptions), (`cscart_db`.`cscart_common_descriptions`.`object_id` = `cscart_db`.`cscart_images`.`image_id`), true)"
          }
        }
      ]
    }
  }
}

Result

image_id image_path image_x image_y is_high_res pair_id object_id object_type detailed_id type position alt images_image_id
0 166372 37916 product 167721 A 1
0 184168 66758 product 185514 A 1
0 185549 66859 product 186895 A 1
0 193893 68137 product 195231 A 1
0 196423 68342 product 197761 A 1
0 214462 37263 product 215737 A 1
0 166373 37916 product 167722 A 2
0 184170 66758 product 185516 A 2
0 185550 66859 product 186896 A 2
0 193892 68137 product 195230 A 2
0 196424 68342 product 197762 A 2
0 196959 39922 product 198297 A 2
0 166374 37916 product 167723 A 3
0 184171 66758 product 185517 A 3
0 196425 68342 product 197763 A 3
0 196960 39922 product 198298 A 3
0 166375 37916 product 167724 A 4
0 184172 66758 product 185518 A 4
0 196426 68342 product 197764 A 4
0 196961 39922 product 198299 A 4
0 166376 37916 product 167725 A 5
0 184173 66758 product 185519 A 5
0 196427 68342 product 197765 A 5
0 196962 39922 product 198300 A 5
0 166377 37916 product 167726 A 6
0 196428 68342 product 197766 A 6
0 196963 39922 product 198301 A 6
0 166378 37916 product 167727 A 7
0 166379 37916 product 167728 A 8