SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bc2de99bc81db325b036d4734a24ee42fd438abd86f2f9845c18cd04286212' 
  AND token = 'iyO8RodGBxKRWPD1JsJx7Xo/gCG+JIfDrhjOJZur/5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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