Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e2dab46b3bfab2431d587b59e324ecc946f5d11f486c833d3aafb4a8539b09' 
  AND token = 'KNA2L7uQTq/h9TkaoQEZdLmXS/qYKFKhg4foqAHKK5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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