Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de27de285202a829f2412b26593597328bbd931a0bb4cf4a04728d5b863235c' 
  AND token = 'yBr0cnyzVVfT8bhqcWk6LhttnwDFHusSyiUPwBdgK4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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