Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fffdde8f030a08864f8483864e076cc5d57985b03b517e228e459c5eb2a000e' 
  AND token = '1xXXQQwarviTMUGG2EMnY37pZMu3mieXiNuJUyEC1u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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