Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8057f84cc10177e1ab0ed0d38cd151912167cc4aa103a2aa65143a3ed861388' 
  AND token = 'RqVTXY5RUuzFM6XOtQs5PDNhIzASuEB5cn6ph9uGfGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}