SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c04f67337123bb6681db18b0fd9e474646e85723ed368972bbdda7f87f0edb' 
  AND token = 'qutJ3WwU/j6vX4W+SMH/ziZ8rqhR+zVW5ZoEi0kMWyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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