SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d18be5a5f4cb8ae5857848a443b2148a3835a92746a9d606fa29e4f0cdb8cc2' 
  AND token = 'gCnaTKZDWYGIgbRtBpQM/3T8hHgEMyxnVn2WKvgUML8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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