SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    101123, 101122, 101121, 101120, 101119, 
    101118, 101117, 101116, 101115, 101114, 
    101113, 101112, 101111, 101110, 101109, 
    101071, 101070, 101069, 101068, 101067
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00046

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_product_descriptions range PRIMARY,product_id PRIMARY 9 20 Using where

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text
101067 LWDNCD04,LW Recordings,Ixiles
101068 LWDNCD04,LW Recordings,Kidd Ross
101069 LWDNCD04,LW Recordings,2Touch,Sergi Yaro
101070 LWDNCD04,LW Recordings,JSED
101071 LWDNCD04,LW Recordings,RomaMoor
101109 HDP01,Traffic Records,BK
101110 HDP01,Traffic Records,BK
101111 HDP01,Traffic Records,BK
101112 HDP01,Traffic Records,Anne Savage,Scott Attrill
101113 HDP01,Traffic Records,Anne Savage,Vinylgroover,The Red Hed,Scott Attrill
101114 HDP01,Traffic Records,Black Russian,Scott Attrill
101115 HDP01,Traffic Records,Joe Rogers,Scott Attrill
101116 HDP01,Traffic Records,Scott Attrill
101117 HDP01,Traffic Records,Scott Attrill,Organ Donors
101118 HDP01,Traffic Records,BK
101119 HDP01,Traffic Records,BK
101120 HDP01,Traffic Records,BK,KY Jelly Babies
101121 HDP01,Traffic Records,BK
101122 HDP01,Traffic Records,BK
101123 HDP01,Traffic Records,BK