SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    5050, 5230, 5250, 5431, 5231, 5367, 4864, 
    4865, 5232, 5432, 5433, 4760, 5408, 
    5410, 5409, 4996, 4997, 5233, 5407, 
    5357, 5434, 4978, 5234, 5435
  )

Query time 0.00098

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 (5050,5230,5250,5431,5231,5367,4864,4865,5232,5432,5433,4760,5408,5410,5409,4996,4997,5233,5407,5357,5434,4978,5234,5435)"
    }
  }
}