Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb5ca484e399b0313fe8a9e34e979f2ed8154e1a67c7689567f6a9c3c31a1a8' 
  AND token = '26aOtBPx5LTU0QmOHyUtZXBUw2N9h4WlSx3vsuMyb00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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