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 = 'ru' 
WHERE 
  cscart_images_links.object_type = 'cp_blog_post' 
  AND cscart_images_links.type = 'M' 
  AND cscart_images_links.object_id IN (16, 15, 14, 13, 12, 6, 2) 
ORDER BY 
  cscart_images_links.position, 
  cscart_images_links.pair_id

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cscart_images_links.position, cscart_images_links.pair_id",
        "table": {
          "table_name": "cscart_images_links",
          "access_type": "range",
          "possible_keys": ["object_id"],
          "key": "object_id",
          "key_length": "81",
          "used_key_parts": ["object_id", "object_type", "type"],
          "rows": 7,
          "filtered": 100,
          "index_condition": "cscart_images_links.object_type = 'cp_blog_post' and cscart_images_links.`type` = 'M' and cscart_images_links.object_id in (16,15,14,13,12,6,2)"
        }
      }
    },
    "table": {
      "table_name": "cscart_images",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "4",
      "used_key_parts": ["image_id"],
      "ref": ["noframes_kz_new.cscart_images_links.image_id"],
      "rows": 1,
      "filtered": 100
    },
    "table": {
      "table_name": "cscart_common_descriptions",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "107",
      "used_key_parts": ["object_id", "lang_code", "object_holder"],
      "ref": ["noframes_kz_new.cscart_images.image_id", "const", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "trigcond(cscart_common_descriptions.object_id = cscart_images.image_id and cscart_common_descriptions.object_holder = 'images' and cscart_common_descriptions.lang_code = 'ru' and trigcond(cscart_images.image_id is not null))"
    }
  }
}

Result

image_id image_path image_x image_y is_high_res rf_original pair_id object_id object_type detailed_id type position alt images_image_id
6661 scale_1200_4zh3-0e.png 988 1140 N scale_1200.png 8451 2 cp_blog_post 0 M 0 6661
6671 1-Oblozhka-min.jpg 1920 1080 N 1-Oblozhka-min.jpg 8461 6 cp_blog_post 0 M 0 6671
7262 1-Oblozhka.jpg 1920 1080 N 1-Oblozhka.jpg 9052 12 cp_blog_post 0 M 0 7262
7263 1-Oblozhka-min.jpg 1920 1080 N 1-Oblozhka-min.jpg 9053 13 cp_blog_post 0 M 0 7263
7264 1-Oblozhka-min_gipp-6f.jpg 1920 1080 N 1-Oblozhka-min.jpg 9054 14 cp_blog_post 0 M 0 7264
7324 1-preobrazit-interyer.jpg 4032 3024 N 1-preobrazit-interyer.jpg 9114 15 cp_blog_post 0 M 0 7324
8558 nofr.jpg 755 425 N nofr.jpg 10348 16 cp_blog_post 0 M 0 8558