Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333dcb9d1121ec022792d3dc626ef2ff313581fd7509fd085af8d78564bcc5e5' 
  AND token = '1aAsEzb6B25QxEiGIOhL866fOqheY7XnDlorvIbeAxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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