Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a2e76f3f4e2fe4b521bccca754db53e02773d03b5af39725d62a860659adc1' 
  AND token = 'vdoq0h9PQILosc7YldYhMl/w3ID/0ESjxsr0Rw4WlEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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