Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6a6676aa097a3980919a64571c405eb7ba9b37cdee5af2d227fd021d7b105c' 
  AND token = 'baAjAyEAQ9uPCN2k8GtRa7wYQptJX8+ou3cZNIwjM10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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