SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230d90b59b8fac18264b46302014c18ddc2357f72df70e3a190e36f6411f63cc' 
  AND token = 'QM/lcjNAcKJDL7BBG/VHvC/0zQIvIfmI/0KwYxN2a54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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