Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cffc3a58770c7c83bc1d12f88336cbfdbe360e28afcdde2763cf616df9e42c2' 
  AND token = 'Ewv0UugaoDAI5CATPeGweLGZmWUYESVzcrJcDxFq3xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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