Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ec829191985eb95666c5c0dfa7c47e721cd7c8d0c6c5c41ce7b31bbf904ee2' 
  AND token = 'zrE83k7Yh8GUCrEZMMNewT8TsjvfSrMAenxS2JUNWJ8=' 
  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"
    }
  }
}