Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642b804129b403003bf96a5007576734ee1299690ee91bb7224ed5ec1751a448' 
  AND token = 'K1OVNeTNAoEqlnnrbcjqI/TgHBQ/69BDyBROyPhCZs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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