SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7c3faa6073305a11d78a14596e5706549957f7a14da2629c6d8f9b3fd89ed3' 
  AND token = 'VDZOuLZv8+/Z1Wz9h2DKowDJ446ougdv/aK8H2YnrrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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