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.detailed_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 = '68506' 
ORDER BY 
  cscart_images_links.position, 
  cscart_images_links.pair_id

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "27.75"
    },
    "ordering_operation": {
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_images_links",
            "access_type": "ref",
            "possible_keys": [
              "object_id",
              "idx_object_type_type_position"
            ],
            "key": "object_id",
            "used_key_parts": [
              "object_id",
              "object_type",
              "type"
            ],
            "key_length": "81",
            "ref": [
              "const",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 11,
            "rows_produced_per_join": 11,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "7.52",
              "eval_cost": "1.10",
              "prefix_cost": "8.62",
              "data_read_per_join": "1K"
            },
            "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.detailed_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 11,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "8.76",
              "eval_cost": "1.10",
              "prefix_cost": "18.48",
              "data_read_per_join": "8K"
            },
            "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": 11,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "8.17",
              "eval_cost": "1.10",
              "prefix_cost": "27.75",
              "data_read_per_join": "6K"
            },
            "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 uc_ptbo-m4.png 4000 4000 N 197822 68506 product 199160 A 10 199160
0 uc_yt91-rt.png 4000 4000 N 197823 68506 product 199161 A 20 199161
0 uc_dwl9-r7.png 4000 4000 N 197824 68506 product 199162 A 30 199162
0 uc_0i2f-ly.png 4000 4000 N 197825 68506 product 199163 A 40 199163
0 uc_pxlv-0i.png 4000 4000 N 197826 68506 product 199164 A 50 199164
0 uc_3u2k-4m.png 4000 4000 N 197827 68506 product 199165 A 60 199165
0 uc_c6jl-0g.png 4000 4000 N 197828 68506 product 199166 A 70 199166
0 uc_iwr7-1c.png 4000 4000 N 197829 68506 product 199167 A 80 199167
0 uc_0zva-cd.png 4000 4000 N 197830 68506 product 199168 A 90 199168
0 uc_ojyb-so.png 4000 4000 N 197831 68506 product 199169 A 100 199169
0 uc_uemx-m5.png 4000 4000 N 197832 68506 product 199170 A 110 199170