SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e618f21a8d4bb25704e2ac03f99cfd3ff2b751448c9600eb323265af4522d7' 
  AND token = 'qGUXEsuUvJL+L2Xtm4jFBNGNaIfSKFRgQdXUiJLjN/A=' 
  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"
    }
  }
}