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, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    1788, 1697, 1657, 1687, 1921, 1238, 1197, 
    1307, 1306, 1940, 1941, 1660, 1751, 
    1677, 1305, 1588, 1662, 1635, 1747, 
    1587, 1771, 1709, 1957, 1707, 1768, 
    1710, 1438, 1954, 1953, 1730, 1686, 
    1593, 1594, 1616, 1773, 1701, 1584, 
    1585, 1868, 1579, 1956, 1495, 1739, 
    1740, 1912, 1913, 1650, 56
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00163

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 48,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (1788,1697,1657,1687,1921,1238,1197,1307,1306,1940,1941,1660,1751,1677,1305,1588,1662,1635,1747,1587,1771,1709,1957,1707,1768,1710,1438,1954,1953,1730,1686,1593,1594,1616,1773,1701,1584,1585,1868,1579,1956,1495,1739,1740,1912,1913,1650,56) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
56
1197
1238
1305
1306
1307
1438
1495
1579
1584
1585
1587
1588
1593
1594
1616
1635
1650
1657
1660
1662
1677
1686
1687
1697
1701
1707
1709
1710
1730
1739
1740
1747
1751
1768
1771
1773
1788
1868
1912
1913
1921
1940
1941
1953
1954
1956
1957