SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282ab8bff99543dc8f9cefc166567375dd93a781e8132fbb710975af01fb2077' 
  AND token = 'hz43djvRiB+2yhx9rxLlwMtrXiZJ6Xqf2bNq/2cpc3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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