Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a40c7539c5bea4c323a32437076a6b13f86495117c024afe082dd397f8e344' 
  AND token = 'WRkdt1MzYMjOqudjI5RQdfcYVJxrsQTuNfS48WUKTm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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