SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ec771d8bb845e8d815becf96ebe4088f9179de340c0051ea854b7f19d177d3' 
  AND token = 'vLDZPa3YOhYO34hGjv5KJVJxVKghoTMXV6/jXgQBejI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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