Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e1fcca6704edea7b4aa044a1f07bba67134f1e3e6ac97bbd3af8762c903a29' 
  AND token = 'UmHmyfRo/xzEc2+Yd1IrA548qOOjOHC2hCZbamyrAjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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