SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf6ffb95c10760ca5f4421805f8587a4f8d73f415152e69e0eebb81b129d27f' 
  AND token = '/JeJumms5kyYiVqyFPGm/vvp/ChcLgcM2/EtqpY1IIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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