Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c59832ffb3adb3e1bfccd6e16fb0587c2d73e656446bb1bfc44c0f99ed41c32' 
  AND token = 'yT+3Ue6vNd8mvjPX7srtodRsOOgBVWJQaXID/oVDbv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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