Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b3a6d35489778a7f1b70db8dae7a6fd90ec46e5b7680b6c7899e64f9edcf9bea' 
  AND token = 'z6ROaGt/1GBhkgq8hHjT8LD01OOXEJChuoPc46GmJ/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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