Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba62945b1f219ea6b680610a620ce27498dcda448eb4cb0c7995a196dbc1d2f6' 
  AND token = 'h3XEg/he0NbHPCS3cGCkmnebfXW4+95AN96xoR4Txio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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