Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cba95e1c645bf3b21858ea6a890871c79a248c575cf3363393f084803e263ef' 
  AND token = 'M4DbFFByfOBYZ00GnjIeOfPvJf6NnggsyLL9sEHQf2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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