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 (
    19565, 19566, 19567, 19568, 19569, 19570, 
    19571, 19572, 19573, 19574, 19575, 
    19576, 19577, 19578, 19579, 19580
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00034

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 (19565,19566,19567,19568,19569,19570,19571,19572,19573,19574,19575,19576,19577,19578,19579,19580) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
19565 Trim assembly - rear wheel house, right<p>Part number 85895G9500NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19566 Cover assembly-height adjust, left<p>Part number 85833G9000VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19567 Cover assembly-height adjust, right<p>Part number 85843G9000VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19568 Trim Assembly - Rear Pillar Left<p>Part number 85850G9510VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19569 Trim Assembly - Rear Pillar Left<p>Part number 858R0G9510VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19570 Trim assembly - rear pillar, right<p>Part number 85860G9510VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19571 Trim assembly - rear pillar, right<p>Part number 858S0G9510VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19572 Trim assembly - rear door scuff, left<p>Part number 85875G9500NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19573 Trim assembly - rear wheel house, left<p>Part number 85890G9500NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19574 Trim assembly - rear door scuff, right<p>Part number 85885G9500NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19575 Glass assembly - windshield<p>Part number 86111G9AM0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19576 Cover Assy-SCC Unit<p>Part number 86355G9500TRI</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19577 Clip Undercover Mount Team<p>Part number 84219C1000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19578 Coupler-undercover mounting clip<p>Part number 84220B2000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19579 Cover - rear bumper, upper<p>Part number 86640G9610</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19580 Cover - Rear Bumper Lower<p>Part number 86612G9500</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>