Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d8dca1d37f06caf70fe69dc34013db637c5c893e959671d87eb709b9dd83e3' 
  AND token = '1x39op6+YFgoSaiiTEDyjP59cpx6XTiZc0IhmYob36s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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