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 (
    1401, 1402, 1403, 1384, 727, 729, 726, 
    1583, 251, 237, 238, 373, 372, 339, 365, 
    236, 786, 381, 389, 1914, 1321, 1368, 
    1877, 1876, 1878, 1806, 1794, 1807, 
    1884, 1886, 1889, 1890, 1881, 1879, 
    1880, 1882, 1888, 1871, 1887, 715, 714, 
    1485, 1915, 345, 1451, 1183, 18, 17, 
    19, 1814, 1813, 1874, 1875, 974, 1574, 
    1575, 1812, 1811, 1507, 1853, 1856, 
    1918, 1919, 1862, 1861, 1857, 1883, 
    1860, 1859, 1854, 1923, 1858, 1922, 
    1855, 1920, 1469, 344, 1850, 1551, 284, 
    1475, 1276, 1569, 1198, 1179, 1281, 
    926, 1258, 1168, 1394, 1259, 1865, 390, 
    1204, 1864, 1863
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00155

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 (1401,1402,1403,1384,727,729,726,1583,251,237,238,373,372,339,365,236,786,381,389,1914,1321,1368,1877,1876,1878,1806,1794,1807,1884,1886,1889,1890,1881,1879,1880,1882,1888,1871,1887,715,714,1485,1915,345,1451,1183,18,17,19,1814,1813,1874,1875,974,1574,1575,1812,1811,1507,1853,1856,1918,1919,1862,1861,1857,1883,1860,1859,1854,1923,1858,1922,1855,1920,1469,344,1850,1551,284,1475,1276,1569,1198,1179,1281,926,1258,1168,1394,1259,1865,390,1204,1864,1863) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
17
18
19
236
237
238
251
284
339
344
345
365
372
373
381
389
390
714
715
726
727
729
786
926
974
1168
1179
1183
1198
1204
1258
1259
1276
1281
1321
1368
1384
1394
1401
1402
1403
1451
1469
1475
1485
1507
1551
1569
1574
1575
1583
1794
1806
1807
1811
1812
1813
1814
1850
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1871
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1886
1887
1888
1889
1890
1914
1915
1918
1919
1920
1922
1923