SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f34a74041a74dbaeb8044208fd785dd2f676b2bf6f389e33813e0cb9efbc0b' 
  AND token = 'FjowHyCPx/zBgpQgvXNw/vvouwVkj8UmfHLHHlvdW7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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