SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f71c47eb8db15d436121e2d12577b4b179531f92aa42fbd71c48d38659d09946' 
  AND token = '7zxXQRhohCHibOaCgshvBtJ1r2/K+dLnZA4Mr0VR2vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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