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 (
    19709, 19710, 19711, 19712, 19713, 19714, 
    19715, 19716, 19717, 19718, 19719, 
    19720, 19721, 19722, 19723, 19724
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00101

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 (19709,19710,19711,19712,19713,19714,19715,19716,19717,19718,19719,19720,19721,19722,19723,19724) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
19709 Fan assembly - engine oil, upper<p>Part number 215203N200</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19710 Pump Assembly-Coolant<p>Part number 251003N100</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19711 Rod assembly - oil level gauge<p>Part number 266113N100</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19712 Guide-Oil Level Gauge<p>Part number 266123N100</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19713 O-ring<p>Part number 266152B000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19714 Sensor and Glow Unit-Water Temperature<p>Part number 392203N030</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19715 Bracket assembly - engine support<p>Part number 216703N002</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19716 Bracket-Engine Mounting Support<p>Part number 21825T4250</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19717 Bracket Assembly - Transmission Mounting<p>Part number 21730T1150</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19718 Bracket assembly - engine mounting, right<p>Part number 21840T1250</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19719 Bracket assembly - engine mounting left<p>Part number 21850T1250</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19720 hanger<p>Part number 28780C1300</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19721 Head subassembly - cylinder, left<p>Part number 221103N100</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19722 Head subassembly - cylinder, left<p>Part number 546G53NA0B</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19723 Head subassembly - cylinder, right<p>Part number 221103N150</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19724 Head subassembly - cylinder, right<p>Part number 547G53NA0A</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>