Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ff65564de4dd1e7fb1c7c866bbbb6fdd0ef528b67fb948611fdfaf79582c77' 
  AND token = 'zVtpdaB+Q+rPFpHI7l6M50j6N1s9sf2aOdEnCKvTKzU=' 
  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"
    }
  }
}