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 = 'variant_image' 
  AND cscart_images_links.type = 'V' 
  AND cscart_images_links.object_id IN (
    50775, 50776, 50845, 50846, 50851, 50852, 
    50863, 50864, 51059, 51060, 51061, 
    51062, 51157, 51158, 51159, 51160, 
    51305, 51306, 51413, 51414, 51679, 
    51680, 51689, 51690, 52085, 52086, 
    55951, 55952, 56363, 56364, 56381, 
    56382, 56425, 56426, 56529, 56530, 
    56553, 56554, 56557, 56558
  ) 
ORDER BY 
  cscart_images_links.position, 
  cscart_images_links.pair_id

Query time 0.00040

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 40 Using index condition; Using filesort
1 SIMPLE cscart_images eq_ref PRIMARY PRIMARY 4 toolboxdigitalshop_dev.cscart_images_links.image_id 1
1 SIMPLE cscart_common_descriptions eq_ref PRIMARY PRIMARY 108 toolboxdigitalshop_dev.cscart_images.image_id,const,const 1 Using where