SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccf8a2c1a82c44b4c632c986caf6c0710fe906e2c75beede181f202d5167361' 
  AND token = 'KABeg+jN4DCO+wL+J7PWZH07vgbvtJOpLJb5mkw1RUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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