Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745956b9c9eb4e4e10796a2eb985a4b0b39affee8b2f350539451da1cbd0cdba' 
  AND token = 'L6m7dffWLIAjKNlDYaL4bYkLAJ/zfVYX7jzK20xxgLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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