Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec8db32d55c35ee3370e016cef7946d77ab3ec317d424bdce20c31e253b9a7f' 
  AND token = '/GMd39wQl34L35w7QBAZM49kYdMT1FPPRrhaTH/zwxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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