SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7563d6377df7920e37f4706a9b42a866f25f3e11b36cb90b43028ba049203521' 
  AND token = '33slG+1L+8xMofBJDvJCuiNZamOq0cmWzK4zcb1kO/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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