Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ebca5d6f155fbcb1236ab38109c8982adae093d3c0077344c12f05ba5f44bf' 
  AND token = 'D2PU9YuYoNsBHS1ZSq9Y/+b965JaiIiqxvvS9q+shR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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