Sandbox

SELECT 
  tconnect_images.*, 
  tconnect_images_links.*, 
  tconnect_common_descriptions.description AS alt, 
  tconnect_images.image_id AS images_image_id 
FROM 
  tconnect_images_links 
  LEFT JOIN tconnect_images ON tconnect_images_links.image_id = tconnect_images.image_id 
  LEFT JOIN tconnect_common_descriptions ON tconnect_common_descriptions.object_id = tconnect_images.image_id 
  AND tconnect_common_descriptions.object_holder = 'images' 
  AND tconnect_common_descriptions.lang_code = 'en' 
WHERE 
  tconnect_images_links.object_type = 'promo' 
  AND tconnect_images_links.type = 'M' 
  AND tconnect_images_links.object_id IS NULL 
ORDER BY 
  tconnect_images_links.position, 
  tconnect_images_links.pair_id

Query time 0.00245

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE"
    }
  }
}