Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8beab34a9cf5e726ded6dd95c069a068356373f71e99c1f732293af6a38a0a8' 
  AND token = '/S7sAZeF2jtfj6qPQpPqqKGr3km2Fnw+N2XgBsrDku8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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