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 (
    1669, 1400, 1673, 403, 358, 1167, 708, 
    1177, 1195, 1208, 1178, 1849, 1846, 
    1848, 1847, 1770, 1769, 1449, 1341, 
    1592, 1474, 1733, 1898, 1899, 1270, 
    1459, 1477, 1891, 1218, 114, 1810, 113, 
    79, 653, 1465, 1494, 1620, 1619, 1624, 
    1681, 1680, 1902
  ) 
  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": 42,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (1669,1400,1673,403,358,1167,708,1177,1195,1208,1178,1849,1846,1848,1847,1770,1769,1449,1341,1592,1474,1733,1898,1899,1270,1459,1477,1891,1218,114,1810,113,79,653,1465,1494,1620,1619,1624,1681,1680,1902) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
79
113
114
358
403
653
708
1167
1177
1178
1195
1208
1218
1270
1341
1400
1449
1459
1465
1474
1477
1494
1592
1619
1620
1624
1669
1673
1680
1681
1733
1769
1770
1810
1846
1847
1848
1849
1891
1898
1899
1902