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 (
    1705, 1704, 1609, 1935, 1936, 1929, 1528, 
    1527, 1526, 1508, 1534, 1533, 1841, 
    1531, 1529, 1530, 1843, 1532, 1515, 
    1904, 1873, 1897, 1896, 1728, 1607, 
    1608, 1606, 1703, 1578, 1396, 1605, 
    1206, 1586, 1934, 1932, 1933, 1656, 
    1542, 1640, 1543, 1655, 1927, 1926, 
    1815, 1808, 1541, 1829, 1828, 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 0.00245

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": 96,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (1705,1704,1609,1935,1936,1929,1528,1527,1526,1508,1534,1533,1841,1531,1529,1530,1843,1532,1515,1904,1873,1897,1896,1728,1607,1608,1606,1703,1578,1396,1605,1206,1586,1934,1932,1933,1656,1542,1640,1543,1655,1927,1926,1815,1808,1541,1829,1828,1675,1931,1544,1845,1540,1512,1525,1536,1538,1937,1581,1582,1838,1938,1830,1514,1835,1678,1693,1711,1699,1698,1869,1834,1833,1928,1537,1539,1436,1411,1397,1741,1330,1486,1546,1651,1661,255,1742,1598,1565,1597,1708,1694,1732,1596,1632,1618) 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
1206
1330
1396
1397
1411
1436
1486
1508
1512
1514
1515
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1536
1537
1538
1539
1540
1541
1542
1543
1544
1546
1565
1578
1581
1582
1586
1596
1597
1598
1605
1606
1607
1608
1609
1618
1632
1640
1651
1655
1656
1661
1675
1678
1693
1694
1698
1699
1703
1704
1705
1708
1711
1728
1732
1741
1742
1808
1815
1828
1829
1830
1833
1834
1835
1838
1841
1843
1845
1869
1873
1896
1897
1904
1926
1927
1928
1929
1931
1932
1933
1934
1935
1936
1937
1938