Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd272d6feda6dfef65c6cd407ddc2fab838e03cdb8b662602d4872b3a6c3e0eda' 
  AND token = 'ZsspuweCAI9DWkFJ3kOBLf0jnoC371lOCFyoMN8yiqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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