SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0988b92ddcc7adedbec51e5f93e0249012479363960b7460ab861857514eb183' 
  AND token = '/hHNJ4hwLxMWvgga/R03+pBliV+Y1ubTbz53+QRCZVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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