SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    19958, 19959, 20134, 19906, 20031, 20032, 
    20183, 19939, 20197, 20196, 20198, 
    20193, 20194, 20195, 20199, 20200, 
    19930, 19985, 19931, 19932, 19895, 
    19933, 20146, 20143
  )

Query time 0.00102

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 24,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (19958,19959,20134,19906,20031,20032,20183,19939,20197,20196,20198,20193,20194,20195,20199,20200,19930,19985,19931,19932,19895,19933,20146,20143)"
    }
  }
}