SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b5e2a6641bb00e8a50930a672009d4265c6dc0ad482ff6f7242b5ebf480936' 
  AND token = 'i+hRYv/jL/cNLPAwfsBHKT61UEFxW5/nFzPZMo8AWp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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