Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f346c3307d05b21df100b92acb53a939427481f25298574987f7548ee9355a81' 
  AND token = 'Zk0niAPXIZvsNQn67sY/4fYx2rqOD1BfQyn8q2c08BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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