SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    231, 232, 233, 234, 235, 236, 237, 238, 
    239, 66, 166, 245, 246, 248, 249, 250, 
    251, 252, 253, 254, 255, 256, 257, 247, 
    278, 280, 282, 286
  )

Query time 0.00098

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rows": 28,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (231,232,233,234,235,236,237,238,239,66,166,245,246,248,249,250,251,252,253,254,255,256,257,247,278,280,282,286)"
        }
      }
    ]
  }
}