SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038d86cfa0b3da3d081f4c5ee175edadb364ccdfb972b570726696189393bd1d' 
  AND token = 'ZHFZu+8z80hRLwb1Jy/U9g50g7yNvZ1CRkKtjzqvwJQ=' 
  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"
    }
  }
}