Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0a77bbbfc29aaeed521f9de2e7a9f664b5a60fe6cedf68efab31057f12918c' 
  AND token = 'IxVnIzgzvtZxpT3LIGzfd5cGwEwBxLkc96eM4E8SZFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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