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.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    19853, 19854, 19855, 19856, 19857, 19858, 
    19859, 19860, 19861, 19862, 19863, 
    19864, 19865, 19866, 19867, 19868
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id", "idx_product_lang"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 16,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (19853,19854,19855,19856,19857,19858,19859,19860,19861,19862,19863,19864,19865,19866,19867,19868) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
19853 Shaft assembly - drive rear, left<p>Part number 49600T6200</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19854 Shaft assembly - drive rear, right<p>Part number 49601T6700</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19855 E-LSD assembly<p>Part number 478004J000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19856 Carrier Assembly - Differential<p>Part number 530004J620</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19857 nut<p>Part number 1339710007K</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19858 Gasket-Turbocharger Oil Feedback<p>Part number 282413N100</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19859 O-ring<p>Part number 282323N040</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19860 Pipe assembly - oil drain, left<p>Part number 282453N101</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19861 Pipe assembly - oil drain, right<p>Part number 282453N111</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19862 Gasket - turbocharger oil drain, A<p>Part number 282463N010</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19863 Gasket - turbocharger oil drain, B<p>Part number 282463N001</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19864 Turbocharger water pipe, left<p>Part number 282513N102</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19865 Turbocharger water pipe, right<p>Part number 282513N112</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19866 Gasket-turbocharger, left<p>Part number 285213N101</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19867 Gasket-turbocharger, right<p>Part number 285213N111</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19868 Protector-heat lower, left<p>Part number 285253N100</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>