SELECT 
  cscart_images_links.*, 
  cscart_images.image_path, 
  cscart_common_descriptions.description AS alt, 
  cscart_images.image_x, 
  cscart_images.image_y, 
  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 = 'variant_image' 
  AND cscart_images_links.type = 'V' 
  AND cscart_images_links.object_id IN (
    20626, 20627, 20628, 20629, 20630, 20631, 
    20632, 20633, 20634, 20635, 20636, 
    20637, 20638, 20639, 20640, 20641, 
    20642, 20643, 20644, 20645, 20646, 
    20647
  ) 
ORDER BY 
  cscart_images_links.position, 
  cscart_images_links.pair_id

Query time 0.00074

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_images_links range object_id object_id 81 22 Using index condition; Using filesort
1 SIMPLE cscart_images eq_ref PRIMARY PRIMARY 3 mahm3t_cs443.cscart_images_links.image_id 1 Using where
1 SIMPLE cscart_common_descriptions eq_ref PRIMARY PRIMARY 107 mahm3t_cs443.cscart_images.image_id,const,const 1 Using where