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 (
    1612, 1267, 1400, 1652, 1309, 1673, 1653, 
    1668, 1634, 1688, 1499, 1613, 1648, 
    1723, 1590, 1510, 1950, 1951, 1924, 
    1949, 1745, 1654, 1501, 69, 89, 1643, 
    1645, 1925, 1666, 1664, 1557, 1695, 
    1559, 1315, 1310, 1471, 1502, 86, 1504, 
    33, 1944, 1942, 1900, 1433, 1777, 1748, 
    1679, 1702
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00157

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 (1612,1267,1400,1652,1309,1673,1653,1668,1634,1688,1499,1613,1648,1723,1590,1510,1950,1951,1924,1949,1745,1654,1501,69,89,1643,1645,1925,1666,1664,1557,1695,1559,1315,1310,1471,1502,86,1504,33,1944,1942,1900,1433,1777,1748,1679,1702) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
33
69
86
89
1267
1309
1310
1315
1400
1433
1471
1499
1501
1502
1504
1510
1557
1559
1590
1612
1613
1634
1643
1645
1648
1652
1653
1654
1664
1666
1668
1673
1679
1688
1695
1702
1723
1745
1748
1777
1900
1924
1925
1942
1944
1949
1950
1951