Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79389efb72274198488ad68afad929f1258cfd29e8c578f87ba68f67d3dcf3d7' 
  AND token = '2aqfTmhZ/uHe29rdKStuWnlTGuel5dUs79isCSnA2u4=' 
  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"
    }
  }
}