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 (
    1562, 1509, 1952, 1700, 1589, 1492, 1316, 
    1690, 1729, 1637, 1731, 1636, 1638, 
    1639, 1629, 1631, 1630, 1622, 1615, 
    1621, 1907, 1955, 1663, 1674, 1490, 
    1746, 1831, 1832, 1591, 1737, 1805, 
    1647, 1774, 281, 1617, 282, 1503, 285, 
    1826, 1646, 1580, 1906, 1611, 1166, 
    67, 1252, 1930, 1561
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00154

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 (1562,1509,1952,1700,1589,1492,1316,1690,1729,1637,1731,1636,1638,1639,1629,1631,1630,1622,1615,1621,1907,1955,1663,1674,1490,1746,1831,1832,1591,1737,1805,1647,1774,281,1617,282,1503,285,1826,1646,1580,1906,1611,1166,67,1252,1930,1561) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
67
281
282
285
1166
1252
1316
1490
1492
1503
1509
1561
1562
1580
1589
1591
1611
1615
1617
1621
1622
1629
1630
1631
1636
1637
1638
1639
1646
1647
1663
1674
1690
1700
1729
1731
1737
1746
1774
1805
1826
1831
1832
1906
1907
1930
1952
1955