SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cbfc841af30e280014268a9f225abb0b38c76fa2ff0131ab3295a4f7610692' 
  AND token = 'Jgpjbb8F6xe9+R4wGhGWQfo3fw9nhkB6ZgUROxqKWVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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