SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d515f34a0ff82a95ff867e9a7e20b6e9bf1eb49467e85628854e6b0438c22c' 
  AND token = 'Xi+eQmQuCZKkvR2HbpzCAjJlyK+o0UerU0Yiq0U38pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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