SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc47e529ed06cf900dc4d486347289d68dfe58be718a1381260f75d82853f0c5' 
  AND token = 'zFqeLGiv034IljwIyOkQR14ZECZZhw8UiBV1zUq0jiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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