Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3be104d03885348a6459ac587ace30d70e1df52334f5860ecc4c9dfad76c0d' 
  AND token = 'JcBkvBeAZI25ZG7wOSHGagEjWA4RbwQsHUPwWmLVY6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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