SELECT 
  links.pair_id, 
  links.image_id, 
  links.detailed_id, 
  links.position, 
  links.object_id, 
  links.object_type, 
  images.image_x AS detailed_image_x, 
  images.image_y AS detailed_image_y, 
  images.image_path AS detailed_image_path, 
  descr.description AS alt 
FROM 
  cscart_images_links AS links 
  LEFT JOIN cscart_images AS images ON links.detailed_id = images.image_id 
  LEFT JOIN cscart_common_descriptions AS descr ON descr.object_id = images.image_id 
  AND descr.object_holder = 'images' 
  AND descr.lang_code = 'en' 
WHERE 
  links.object_id = 69574 
  AND links.object_type = 'product' 
  AND links.type = 'A' 
ORDER BY 
  links.position, 
  links.pair_id 
LIMIT 
  1

Query time 0.00066

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.05"
    },
    "ordering_operation": {
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "links",
            "access_type": "ref",
            "possible_keys": [
              "object_id"
            ],
            "key": "object_id",
            "used_key_parts": [
              "object_id",
              "object_type",
              "type"
            ],
            "key_length": "81",
            "ref": [
              "const",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.25",
              "eval_cost": "0.10",
              "prefix_cost": "0.35",
              "data_read_per_join": "104"
            },
            "used_columns": [
              "pair_id",
              "object_id",
              "object_type",
              "image_id",
              "detailed_id",
              "type",
              "position"
            ]
          }
        },
        {
          "table": {
            "table_name": "images",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "image_id"
            ],
            "key_length": "4",
            "ref": [
              "chocoramo.links.detailed_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.25",
              "eval_cost": "0.10",
              "prefix_cost": "0.70",
              "data_read_per_join": "792"
            },
            "used_columns": [
              "image_id",
              "image_path",
              "image_x",
              "image_y"
            ]
          }
        },
        {
          "table": {
            "table_name": "descr",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "object_id",
              "lang_code",
              "object_holder"
            ],
            "key_length": "108",
            "ref": [
              "chocoramo.images.image_id",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 1,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.25",
              "eval_cost": "0.10",
              "prefix_cost": "1.05",
              "data_read_per_join": "608"
            },
            "used_columns": [
              "object_id",
              "description",
              "lang_code",
              "object_holder"
            ]
          }
        }
      ]
    }
  }
}