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 (
    1675, 1931, 1544, 1845, 1540, 1512, 1525, 
    1536, 1538, 1937, 1581, 1582, 1838, 
    1938, 1830, 1514, 1835, 1678, 1693, 
    1711, 1699, 1698, 1869, 1834, 1833, 
    1928, 1537, 1539, 1436, 1411, 1397, 
    1741, 1330, 1486, 1546, 1651, 1661, 
    255, 1742, 1598, 1565, 1597, 1708, 1694, 
    1732, 1596, 1632, 1618
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00151

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 (1675,1931,1544,1845,1540,1512,1525,1536,1538,1937,1581,1582,1838,1938,1830,1514,1835,1678,1693,1711,1699,1698,1869,1834,1833,1928,1537,1539,1436,1411,1397,1741,1330,1486,1546,1651,1661,255,1742,1598,1565,1597,1708,1694,1732,1596,1632,1618) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
255
1330
1397
1411
1436
1486
1512
1514
1525
1536
1537
1538
1539
1540
1544
1546
1565
1581
1582
1596
1597
1598
1618
1632
1651
1661
1675
1678
1693
1694
1698
1699
1708
1711
1732
1741
1742
1830
1833
1834
1835
1838
1845
1869
1928
1931
1937
1938