SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a05933e69942c15a5c31cc236fff8f7bb55b930976c3f0379154878748e03b' 
  AND token = 'NXrCNixUQoOJDlStlYMY79BqST+ZU4MHtUWsnmGuGj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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