Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8d4770ae09275b5b155cc76b22647973066480c0cacf311013c6453f927474d9' 
  AND token = '99UbxdYBja6t1PbfE9kJBFSvM5PbQB0h71EW8Grkr+I=' 
  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"
    }
  }
}