Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef47d2b0fa9d2d54bca81239f13bad96fecbd91622abed9b036360411cd3045' 
  AND token = 'c/FGaDnOhLddH0vDUfMvDevRFZ5+Rehl0lDQBLdChsA=' 
  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"
    }
  }
}