Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369390bdedece81b33f163a362fce5a29fbf134992ffd675c3135208244179d6' 
  AND token = 'pwt6sqwMwShklZ3DHNP7o5yaIzRwUF9qA3AyGikbBb4=' 
  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"
    }
  }
}