Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768da9c3d7ad8362b94b0c6afde033c67ad9d241d127f8343cfee90a505cf730' 
  AND token = 'taYUdGGtX/LWlfJp5xHF3dNFf99TBW43UBEBBZlyw3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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