Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b721e9c83f6afc3ca32b093d96bd57af51b47f1b9d1235435401396be12be701' 
  AND token = '2lF6GNpwJ9jlEREhkArpOR1s5XKt1UI4r4O4CS1MWvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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