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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 = 'promo' 
  AND cscart_images_links.type = 'M' 
  AND cscart_images_links.object_id IS NULL 
ORDER BY 
  cscart_images_links.position, 
  cscart_images_links.pair_id

Query time 0.00103

JSON explain

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