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 (
    1431, 360, 1479, 1478, 414, 1866, 1427, 
    788, 1084, 1407, 1903, 1452, 1453, 538, 
    1864, 1863, 1461, 1199, 1943, 1901, 
    1200, 1212, 1939, 1211, 759, 1415, 1255, 
    1796, 23, 24, 1468, 1466, 1467, 1482, 
    1484, 1568, 1535, 1566, 1567, 1444, 
    1418, 1443, 1054, 1369, 1370, 60, 808, 
    1274
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00159

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 (1431,360,1479,1478,414,1866,1427,788,1084,1407,1903,1452,1453,538,1864,1863,1461,1199,1943,1901,1200,1212,1939,1211,759,1415,1255,1796,23,24,1468,1466,1467,1482,1484,1568,1535,1566,1567,1444,1418,1443,1054,1369,1370,60,808,1274) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
23
24
60
360
414
538
759
788
808
1054
1084
1199
1200
1211
1212
1255
1274
1369
1370
1407
1415
1418
1427
1431
1443
1444
1452
1453
1461
1466
1467
1468
1478
1479
1482
1484
1535
1566
1567
1568
1796
1863
1864
1866
1901
1903
1939
1943