Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16bb8c2341c344fe134ef60db1f660c39f4434a32818259f084c4ce71ca0033' 
  AND token = 'OqRMDLrucaHNQLZb4ZmemmoPVK5I44MLfMzz7B33XYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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